Improvement of the Gross Theory of β-Decay. II

Tachibana, Takeshi; Yamada, Masami; Yoshida, Y.

doi:10.1143/ptp.84.641

Cited by 90 publications

(86 citation statements)

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“…Second, the new half-lives for very-neutron rich Zn and Ga isotopes have questioned the global β-decay calculations in this region whichdo not properly account for ground state spin-parity inversion and the firstforbidden transitions.The "Gross Theory" [8], parameterization underestimate both old and new Zn, Ga data significantly (not shown in figures 1,2). Thus, it can not provide a reliable r-process modeling in specific region of 78 Ni.…”

Section: Global Modelsmentioning

confidence: 86%

“…Below we compare the experimental half-lives and delayed neutron emission total P n -values with the ones from the global models [8][9][10][11][12] figures 1, 2) show the semimicroscopic global models fail to describe the ground state properties in the most neutron rich region of nuclear chart. Description of spherical sub-shell closure at N=58 [1] is beyond their performance.…”

Section: Global Modelsmentioning

confidence: 99%

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Evolution of single-particle structure and beta-decay near⁷⁸Ni

Borzov

2012

EPJ Web of Conferences

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Abstract.The extended self-consistent beta-decay model has been applied for bet-decay rates and delayed neutron emission probabilities of spherical neutron-rich isotopes near the r-process paths. Unlike a popular global FRDM+RPA model, in our fully microscopic approach, the Gamow-Teller and first-forbidden decays are treated on the same footing. The model has been augmented by blocking of the odd particle in order to account for important ground-state spin-parity inversion effect which has been shown to exist in the region of the most neutron-rich doubly-magic nucleus 78 Ni. Finally, a newly developed form of density functional DF3a has been employed which gives a better spin-orbit splitting due to the modified tensor components of the density functional.

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Section: Global Modelsmentioning

confidence: 86%

Section: Global Modelsmentioning

confidence: 99%

Evolution of single-particle structure and beta-decay near⁷⁸Ni

Borzov

2012

EPJ Web of Conferences

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“…• for compiled experimental and theoretical β-decay and electron capture rates: -the experimental β-decay rates of Katakura (1996); -the β-decay rates of Takahashi & Yokoi (1987, see also Goriely 1999; -specific electron capture rates from various published sources; -β-decay rates calculated with the revised Gross theory (Tachibana et al 1990) and Q-values from the HFB-14 mass model; -β-decay rates calculated with the QRPA plus FRDM models by Möller et al (1996); -the density-and temperature-dependent β-decay rates calculated by Oda et al (1994) or Langanke & Martinez-Pinedo (2000).…”

Section: Contentmentioning

confidence: 99%

Databases and tools for nuclear astrophysics applications

Goriely

Jorissen

et al. 2013

A&A

128

118

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An update of a previous description of the BRUSLIB + NACRE package of nuclear data for astrophysics and of the web-based nuclear network generator NETGEN is presented. The new version of BRUSLIB contains the latest predictions of a wide variety of nuclear data based on the most recent version of the Brussels-Montreal Skyrme-Hartree-Fock-Bogoliubov model. The nuclear masses, radii, spin/parities, deformations, single-particle schemes, matter densities, nuclear level densities, E1 strength functions, fission properties, and partition functions are provided for all nuclei lying between the proton and neutron drip lines over the 8 ≤ Z ≤ 110 range, whose evaluation is based on a unique microscopic model that ensures a good compromise between accuracy, reliability, and feasibility. In addition, these various ingredients are used to calculate about 100 000 Hauser-Feshbach neutron-, proton-, α-, and γ-induced reaction rates based on the reaction code TALYS. NACRE is superseded by the NACRE II compilation for 15 charged-particle transfer reactions and 19 charged-particle radiative captures on stable targets with mass numbers A < 16. NACRE II features the inclusion of experimental data made available after the publication of NACRE in 1999 and up to 2011. In addition, the extrapolation of the available data to the very low energies of astrophysical relevance is improved through the systematic use of phenomenological potential models. Uncertainties in the rates are also evaluated on this basis. Finally, the latest release v10.0 of the web-based tool NETGEN is presented. In addition to the data already used in the previous NETGEN package, it contains in a fully documented form the new BRUSLIB and NACRE II data, as well as new experiment-based radiative neutron capture cross sections. The full new versions of BRUSLIB, NACRE II, and NETGEN are available electronically from the nuclear database at http://www. astro.ulb.ac.be/NuclearData. The nuclear material is presented in an extended tabular form complemented with a variety of graphical interfaces.

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“…In the previous publication [9], the present authors applied the summation method fully based on the individual calculated spectra with the generation-2 version of the gross theory of beta decay [10][11][12]. Though the overall agreement of the calculated results with the experimental data by Shreckenbach et al were fairly good, the C/E values varied from 1.0 to 1.3 even in the 3 ∼ 6 MeV region where the gross approximation is most definitely valid and also the spectra are important for applications.…”

Section: Introductionmentioning

confidence: 99%

Analysis of reactor-neutrino spectra fully based on gross theory of beta-decay emphasizing the special role of odd-odd FP nuclides

2017

Self Cite

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Abstract. We applied the gross theory of β-decay to calculate the reactor antineutrino (ν e ) spectra emitted from 235,238 U and 239,241 Pu samples under neutron irradiation by summing up all the contributions from a large number of decaying fission-products (FPs). Considering the special role of the odd(Z )-odd(N ) FPs in spectrum-shaping, we utilized the experimentally-known spin-parity of each odd-odd FP through the treatment proposed by Nakata, Tachibana and Yamada. Owing to this treatment, the consistency between calculated and experimental spectra was remarkably improved in a way expected from the nature of the gross theory of β-decay.

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Improvement of the Gross Theory of β-Decay. II

Cited by 90 publications

References 0 publications

Evolution of single-particle structure and beta-decay near⁷⁸Ni

Evolution of single-particle structure and beta-decay near⁷⁸Ni

Databases and tools for nuclear astrophysics applications

Analysis of reactor-neutrino spectra fully based on gross theory of beta-decay emphasizing the special role of odd-odd FP nuclides

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Improvement of the Gross Theory of β-Decay. II

Cited by 90 publications

References 0 publications

Evolution of single-particle structure and beta-decay near78Ni

Evolution of single-particle structure and beta-decay near78Ni

Databases and tools for nuclear astrophysics applications

Analysis of reactor-neutrino spectra fully based on gross theory of beta-decay emphasizing the special role of odd-odd FP nuclides

Contact Info

Product

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Evolution of single-particle structure and beta-decay near⁷⁸Ni

Evolution of single-particle structure and beta-decay near⁷⁸Ni